By Guy Taylor An end to Eurostar’s monopoly on the Channel Tunnel can only be a good thing for passengers, Guy Taylor argues For three decades, the French high speed operator has whizzed customers across the UK, France, the Netherlands, Germany and Belgium. But now at least five companies are interested in launching a rival. Among them, Richard Branson’s Virgin Group, Spain’s Evolyn and the newly established Dutch operator Heuro. A new competitor would no doubt push Eurostar to improve punctuality, reduce disruption and, ultimately, lower fares. Just look at the influx of open access operators…